header {
    height: 10.5vw;
}


/*轮播图*/
#banner img{
    display: block;
    width: 100vw;
}
#banner{
    overflow: hidden;
    position: relative;
}
#imgs{
    position: relative;
    left: 0;
    display: flex;
    flex-flow: row nowrap;
}

#dots{
    position: absolute;
    bottom: 3vw;
    left: 35vw;
    width: 30vw;
    height: 2vw;
    display: flex;
    justify-content: space-between;
}
#dots li{
    width: 2vw;
    height: 2vw;
    border: 1px solid #fff;
    /*background: #fff;*/
    border-radius: 50%;
}
#dots li.ban_dots_active{
    background: #fff;
}


.main {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    margin-top: -5px;
}

.main a {
    display: inline-block;
    width: 33.33333%;
    height: 28.9vw;
    text-align: center;
    padding: 6.9vw 0;
    font-size: 3vw;
    color: #4d4d4d;
    border-right: 1px solid #f5f5f5;
    border-bottom: 1px solid #f5f5f5;
}

.main a:nth-of-type(3n),
.main a:last-child {
    border-right: none;
}

.main span {
    width: 11vw;
    height: 11vw;
    display: block;
    background-image: url(../img/index.jpg);
    background-origin: padding-box;
    background-position: -11.1vw -6.1vw;
    background-repeat: no-repeat;
    margin: 0 auto;
    background-size: 100vw auto;
}

.main a:nth-of-type(2) span {
    background-position: -44.5vw -6.1vw;
}

.main a:nth-of-type(3) span {
    background-position: -77.8vw -6.1vw;
}

.main a:nth-of-type(4) span {
    background-position: -11.1vw -34.8vw;
}

.main a:nth-of-type(5) span {
    background-position: -44.5vw -34.8vw;
}

.main a:nth-of-type(6) span {
    background-position: -77.8vw -34.8vw;
}

.main a:nth-of-type(7) span {
    background-position: -11.1vw -64.2vw;
    ;
}

.main a:nth-of-type(8) span {
    background-position: -44.5vw -64.2vw;
}

.main a:nth-of-type(9) span {
    background-position: -77.8vw -64.2vw;
}

.main a:nth-of-type(10) span {
    background-position: -19.1vw -92.8vw;
}

.main a:nth-of-type(11) span {
    background-position: -70.1vw -92.8vw;
}

.main a:nth-of-type(12) span {
    background-position: -19.1vw -121.4vw;
}

.main a:nth-of-type(13) span {
    background-position: -70.1vw -121.4vw;
}

.main a:nth-of-type(10) {
    width: 50vw;
}

.main a:nth-of-type(11) {
    width: 50vw;
}

.main a:nth-of-type(12) {
    width: 50vw;
}

.main a:nth-of-type(13) {
    width: 50vw;
}